Airtel coding interview
questions, leaked.
6 problems reported across recent Airtel interviews. Top patterns: array, string, prefix sum. The list below is what most reported candidates actually saw, plus the honest play if you can't grind all of it.
Airtel's coding assessment is lean and medium-heavy. With 5 out of 6 problems sitting at medium difficulty, you're not walking into a gauntlet of easy warm-ups. Arrays dominate the problem set, appearing in two thirds of what they ask. Strings and prefix-sum patterns show up repeatedly too. The good news: the problem types are standard, which means if you've drilled the right patterns, you'll recognize each one on sight. If you blank mid-assessment, StealthCoder runs invisibly during your screen share and surfaces a working solution in seconds, leaving you free to move on without panic.
Top problems at Airtel
| # | Problem | Diff | Frequency | Pass % | Patterns |
|---|---|---|---|---|---|
| 01 | Find Polygon With the Largest Perimeter | MEDIUM | 100.0 | 65% | Array · Greedy · Sorting |
| 02 | XOR Queries of a Subarray | MEDIUM | 97.9 | 78% | Array · Bit Manipulation · Prefix Sum |
| 03 | Longest Substring Without Repeating Characters | MEDIUM | 77.8 | 37% | Hash Table · String · Sliding Window |
| 04 | Find First and Last Position of Element in Sorted Array | MEDIUM | 62.5 | 47% | Array · Binary Search |
| 05 | Generate Parentheses | MEDIUM | 62.5 | 77% | String · Dynamic Programming · Backtracking |
| 06 | Best Time to Buy and Sell Stock | EASY | 62.5 | 55% | Array · Dynamic Programming |
Frequencies derived from public community-tagged interview reports. Click a row to view on LeetCode.
You have a week, maybe less. You can't out-grind the list above. StealthCoder runs invisibly during the actual Airtel OA. The proctor cannot see it. Screen share cannot detect it. Made for the engineer who has done the work but might still blank with a webcam pointed at him.
Get StealthCoder- array4 · 67%
- string2 · 33%
- prefix sum2 · 33%
- dynamic programming2 · 33%
- binary search1 · 17%
- hash table1 · 17%
- sliding window1 · 17%
- greedy1 · 17%
- sorting1 · 17%
- backtracking1 · 17%
Array problems are the backbone here. Expect prefix-sum work, binary search on sorted data, and greedy array manipulation. Strings appear as secondary challenges, usually paired with hash tables or sliding windows for subarray tracking. What's notable is the absence of hard problems entirely. Your prep shouldn't aim for competitive-programming wizardry. Instead, nail the medium-tier fundamentals: prefix-sum construction, binary search bounds, sliding-window mechanics, and backtracking for constraint-satisfaction problems like parenthesis generation. Dynamic programming shows up twice, but both times it's woven into problems you'd solve intuitively first. The one easy problem, Best Time to Buy and Sell Stock, is your confidence builder. If you hit a wall on a sliding-window or prefix-sum variant, StealthCoder is the safety net that surfaces a clean implementation without the proctor knowing.
Companies with similar patterns
If you prepped for Airtel, these companies recycle ~60% of the same topics.
You've seen the list.
Now make sure you pass Airtel.
Memorizing every problem above in a week is a fantasy. StealthCoder is the hedge: an AI overlay that's invisible during screen share. It reads the problem on screen and surfaces a working solution in under 2 seconds. Made for the engineer who has done the work but might still blank with a webcam pointed at him. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Airtel interview FAQ
How many array problems should I solve before the Airtel assessment?+
Array work dominates here, appearing in 4 of 6 problems. Drill at least 8 to 10 standard array patterns: prefix sums, binary search, sliding windows, and sorting-based approaches. The Airtel set itself shows polygon-perimeter, XOR subarrays, and stock-trading variants. Know those cold.
Is dynamic programming a major focus for Airtel?+
It appears in 2 problems, but both times it's secondary to the main pattern. Best Time to Buy and Sell Stock is pure DP if you think recursively, but greedy works too. Generate Parentheses demands backtracking more than DP logic. Don't over-invest in DP theory here.
Should I study prefix sums before this interview?+
Yes. Prefix sums appear in at least 2 top problems directly and unlock several array optimizations. You'll see them in both polygon-perimeter and XOR-subarray queries. Spend a dedicated session on prefix-sum construction and range-query logic.
What's the hardest problem Airtel typically asks?+
All problems sit at medium difficulty or easy. There are no hard problems in the dataset. This means the bar is consistency and correctness under time pressure, not algorithmic innovation. A clean, working solution beats a clever one that times out.
Is binary search important for Airtel's assessment?+
It appears once in the top problems (Find First and Last Position), but it's a classic pattern. If binary search isn't second nature yet, drill it as a refresher. One question isn't the focus, but missing it is an easy loss.